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为了实现高光效、高显色性且色温可调的白光LED,对四种单基色蓝、绿、黄、红光LED的混光进行了研究。基于Yoshi-单色光模型和光的叠加原理,通过改变四种LED芯片的组合方式(峰值波长、相对光功率配比),对不同色温区的混合白光的显色指数(Ra)、色品质数(Qa)和光视效能(K)进行了仿真计算和光谱优化选择。结果表明:在2 700~6 500K色温范围内,峰值波长为445nm,500nm,560nm,620nm的组合可以得到高Ra值和高Qa值;峰值波长为445nm,535nm,590nm,615nm的组合可以得到较高K值。此外还分析了组合白光LED光谱参数对Ra、Qa、K及相关色温的影响。
In order to achieve high luminous efficiency, high color rendering and adjustable white LED temperature, four single-color blue, green, yellow, red LED mixed light were studied. Based on the Yoshi-monochromatic model and the principle of superposition of light, the color rendering index (Ra) and color quality of mixed white light in different color temperature regions were changed by changing the combination of four LED chips (peak wavelength and relative optical power) (Qa) and optical performance (K) were simulated and optimized for spectral selection. The results show that the combination of peak wavelength of 445nm, 500nm, 560nm and 620nm can obtain high Ra and high Qa values in the range of color temperature from 2 700 to 6 500 K; the peak wavelength of 445 nm, 535 nm, 590 nm and 615 nm can be compared High K value. In addition, the effects of the combined white LED spectral parameters on Ra, Qa, K and related color temperature were also analyzed.